<template>
    <div>
        <el-tree :data="menus" :props="defaultProps" :expand-on-click-node="false" show-checkbox node-key="catId"
            :default-expanded-keys="expandedKey" draggable :allow-drop="allowDrop" @node-drop="handleDrop">
            <span class="custom-tree-node" slot-scope="{ node, data }">
                <span>{{ node.label }}</span>
                <span>
                    <el-button v-if="node.level <= 2" type="text" size="mini" @click="() => append(data)">
                        Append
                    </el-button>
                    <el-button type="text" size="mini" @click="edit(data)">
                        edit
                    </el-button>
                    <el-button v-if="node.childNodes.length == 0" type="text" size="mini"
                        @click="() => remove(node, data)">
                        Delete
                    </el-button>
                </span>
            </span>
        </el-tree>

        <el-dialog :title="title" :visible.sync="dialogVisible" :close-on-click-modal="false" width="30%">
            <el-form :model="category">
                <el-form-item label="活动名称">
                    <el-input v-model="category.name" autocomplete="off"></el-input>
                </el-form-item>
                <el-form-item label="图标">
                    <el-input v-model="category.icon" autocomplete="off"></el-input>
                </el-form-item>
                <el-form-item label="计量单位">
                    <el-input v-model="category.productUnit" autocomplete="off"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="dialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="submitData">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>

export default {
    components: {},
    props: {},
    data() {
        return {
            pCid: [],
            updateNodes: [],
            maxLevel: 0,
            title: "",
            dialogType: "",
            category: { name: "", parentCid: 0, catLevel: 0, showStatus: 1, sort: 0, icon: "", productUnit: "", catId: null },
            dialogVisible: false,
            menus: [],
            expandedKey: [],
            defaultProps: {
                children: 'children',
                label: 'name'
            }
        };
    },
    methods: {
        handleDrop(draggingNode, dropNode, dropType) {
            console.log('tree drop: ', draggingNode, dropNode, dropType);
            //1.当前节点最新的父节点id
            let pCid = 0;
            let siblings = null;
            if (dropType == "before" || dropType == "after") {
                pCid = dropNode.parent.data.catId == undefined ? 0 : dropNode.parent.data.catId;
                siblings = dropNode.parent.childNodes;
            } else {
                pCid = dropNode.data.catId;
                siblings = dropNode.childNodes;
            }
            this.pCid.push(pCid);

            //2、当前拖拽节点的最新顺序，
            for (let i = 0; i < siblings.length; i++) {
                if (siblings[i].data.catId == draggingNode.data.catId) {
                    //如果遍历的是当前正在拖拽的节点
                    let catLevel = draggingNode.level;
                    if (siblings[i].level != draggingNode.level) {
                        //当前节点的层级发生变化
                        catLevel = siblings[i].level;
                        //修改他子节点的层级
                        this.updateChildNodeLevel(siblings[i]);
                    }
                    this.updateNodes.push({
                        catId: siblings[i].data.catId,
                        sort: i,
                        parentCid: pCid,
                        catLevel: catLevel
                    });
                } else {
                    this.updateNodes.push({ catId: siblings[i].data.catId, sort: i });
                }
            }

            //3、当前拖拽节点的最新层级
            console.log("updateNodes", this.updateNodes);
        },
        updateChildNodeLevel(node) {
            if (node.childNodes.length > 0) {
                for (let i = 0; i < node.childNodes.length; i++) {
                    const cNode = node.childNodes[i].data;
                    this.updateNodes.push({
                        catId: cNode.catId,
                        catLevel: node.childNodes[i].level
                    });
                    this.updateChildNodeLevel(node.childNodes[i]);
                }
            }
        },
        allowDrop(draggingNode, dropNode, type) {
            //1、被拖动的当前节点以及所在的父节点总层数不能大于3

            //1）、被拖动的当前节点总层数
            console.log("allowDrop:", draggingNode, dropNode, type);
            //
            this.countNodeLevel(draggingNode);
            //当前正在拖动的节点+父节点所在的深度不大于3即可
            let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;
            console.log("深度：", deep);

            //   this.maxLevel
            if (type == "inner") {
                // console.log(
                //   `this.maxLevel：${this.maxLevel}；draggingNode.data.catLevel：${draggingNode.data.catLevel}；dropNode.level：${dropNode.level}`
                // );
                return deep + dropNode.level <= 3;
            } else {
                return deep + dropNode.parent.level <= 3;
            }
        },
        countNodeLevel(node) {
            //找出所有子节点，求出最大深度
            if (node.children != null && node.children.length > 0) {
                for (let i = 0; i < node.children.length; i++) {
                    if (node.children[i].catLevel > this.maxLevel) {
                        this.maxLevel = node.children[i].catLevel;
                    }
                    this.countNodeLevel(node.children[i]);
                }
            }
        },
        edit(data) {
            this.dialogType = "edit";
            console.log("edit,", data);
            this.title = "修改分类";
            this.dialogVisible = true;

            //发送请求获取最新的数据，对他进行一个修改
            this.$http({
                url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
                method: 'get',
            }).then(({ data }) => {
                // 请求成功
                console.log("要回显示的数据：", data);
                this.category.name = data.data.name;
                this.category.catId = data.data.catId;
                this.category.icon = data.data.icon;
                this.category.productUnit = data.data.productUnit;
                this.category.parentCid = data.data.parentCid;
            });

        },
        append(data) {
            this.dialogType = "add";
            console.log("append", data);
            this.title = "添加分类";
            this.dialogVisible = true;
            this.category.parentCid = data.catId;
            this.category.catLevel = data.catLevel * 1 + 1;
            this.category.catId = null;
            this.category.name = "";
            this.category.icon = "";
            this.category.productUnit = "";
            this.category.sort = 0;
            this.category.showStatus = 1;
        },

        submitData() {
            if (this.dialogType == "add") {
                this.addCategory();
            }
            if (this.dialogType == "edit") {
                this.editCategory();
            }
        },
        //修改三级分类的数据
        editCategory() {
            var { catId, name, icon, productUnit } = this.category;
            console.log("editCategory后", { catId, name, icon, productUnit });
            this.$http({
                url: this.$http.adornUrl(`/product/category/update`),
                method: 'post',
                data: this.$http.adornData({ catId, name, icon, productUnit }, false)
            }).then(({ data }) => {
                // 处理响应数据
                this.$message({
                    message: '菜单修改成功。',
                    type: 'success'
                });
                //关闭菜单
                this.dialogVisible = false;
                //刷新出菜单
                this.getMenus();
                this.expandedKey = [this.category.parentCid];
            });
        },
        addCategory() {
            console.log("提交的数据，", this.category);
            this.$http({
                url: this.$http.adornUrl('/product/category/save'),
                method: 'post',
                data: this.$http.adornData(this.category, false)
            }).then(({ data }) => {
                // 处理响应数据
                this.$message({
                    message: '菜单保存成功。',
                    type: 'success'
                });
                //关闭菜单
                this.dialogVisible = false;
                //刷新出菜单
                this.getMenus();
                this.expandedKey = [this.category.parentCid];
            });
        },

        remove(node, data) {
            var ids = [data.catId];
            this.$confirm(`是否删除【${data.name}】？`, '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                this.$http({
                    url: this.$http.adornUrl('/product/category/delete'),
                    method: 'post',
                    data: this.$http.adornData(ids, false)
                }).then(({ data }) => {
                    // 处理响应数据
                    this.$message({
                        message: '菜单删除成功。',
                        type: 'success'
                    });
                    this.getMenus();
                    this.expandedKey = [node.parent.data.catId]
                });
            }).catch(() => {
                this.$message({
                    type: 'info',
                    message: '已取消删除'
                });
            });

            console.log("remove", node, data);
        },
        getMenus() {
            this.$http({
                url: this.$http.adornUrl('/product/category/list/tree'),
                method: 'get',
            }).then(({ data }) => {
                console.log("成功获取到后台数据", data.data);
                this.menus = data.data;
            })
        }
    },
    created() {
        this.getMenus();
    }
}
</script>

<style scoped lang="scss"></style>
